@Chayo You will need a Japanese to make reservations and go along with you. Saito-san is not running a travel agency. Does not seem ethically right for you to request Saito-san to arrange a Japanese speaker to go with you. Just my two cents worth.
Sorry for the late reply but I think that they only accept reservations via facebook from Japanese customers . I actually gave the contact of one of my friends in Japan instead of my own information. (+ I wrote to them in Japanese). They must've thought I was Japanese haha. Maybe next time you should try that instead.
Starting with soup, there will be six creative dishes made using wagyu, followed by hand-rolled sushi, shabu-shabu, steak, rice（ramen）, and dessert.
All the portions are rather small, but there are quite a number of dishes.
Dons de la nature is said to be a quality restaurant, but when I ate there before, the steak had several grilling issues that seemed to have been caused by insufficient technique by the chef.
If you are planning to go to either one of the two now, I would recommend vesta.
Below are the prices and the cancellation charges quoted by my hotel for satake when I went for lunch early this month(Aug 2018).
Restaurant: Sushi Satake
Course: 12,960JPY per person course only
Cancellation policy: 100% of te course if you cancel the reservation on the reservation day.